The spreadsheet creates columns for all the fields found in the database.
So it’s normal that it found the old fields and displayed columns.
If you don’t want to use the field, you can delete it completely from the spreadsheet AND the database. Just right-click on the column and select “delete field” in the contextual menu.
Or you can disable the column (but not delete the database field), by going to the columns manager and deactivate the column.